Multicol block should be processed by Legacy Layout engine.

third_party/WebKit/Source/core/layout/ng/ng_block_node.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/layout/ng/ng_block_node.h"
 
 #include "core/layout/LayoutBlockFlow.h"
 #include "core/layout/LayoutMultiColumnFlowThread.h"
 #include "core/layout/LayoutMultiColumnSet.h"
 #include "core/layout/api/LineLayoutAPIShim.h"
@@ skipping 220 matching lines @@
   return first_child_;
 }
 
 DEFINE_TRACE(NGBlockNode) {
   visitor->trace(next_sibling_);
   visitor->trace(first_child_);
   NGLayoutInputNode::trace(visitor);
 }
 
 bool NGBlockNode::CanUseNewLayout() {
+  // [Multicol]: for the 1st phase of LayoutNG's multicol implementation we want
+  // to utilize the existing ColumnBalancer class. That's why a multicol block
+  // should be processed by Legacy Layout engine.
+  if (Style().specifiesColumns())
+    return false;
+
   if (!layout_box_->isLayoutBlockFlow())
     return false;
   return RuntimeEnabledFeatures::layoutNGEnabled() || !HasInlineChildren();
 }
 
 bool NGBlockNode::HasInlineChildren() {
   if (!layout_box_->isLayoutBlockFlow())
     return false;
 
   const LayoutBlockFlow* block_flow = toLayoutBlockFlow(layout_box_);
@@ skipping 118 matching lines @@
 
 // Save static position for legacy AbsPos layout.
 void NGBlockNode::SaveStaticOffsetForLegacy(const NGLogicalOffset& offset) {
   DCHECK(layout_box_->isOutOfFlowPositioned());
   DCHECK(layout_box_->layer());
   layout_box_->layer()->setStaticBlockPosition(offset.block_offset);
   layout_box_->layer()->setStaticInlinePosition(offset.inline_offset);
 }
 
 }  // namespace blink